# Convert Masks, Drill 1

It’s practice, man, practice. Are we really talking about practice? Sure. Plain and simple, just some extra practice converting from one mask format to another. But how fast can you go? And can you reach your time goal every time, for every mask? And can you cull out and reject masks that are simply incorrect? Today’s post can help.

Today’s post lists a table of 6 questions, with three columns: a column for the binary mask, one for the Dotted Decimal Notation (DDN) mask, and one for the prefix style mask. The problem statement lists only one of the types of masks. Your job: complete the table, or note that it’s illegal. Get your stopwatch ready before you click over to the next page! Also, read the below post or book for more on how to do it. Ready, steady, go!

## Today’s Problems:

Start your timer. Answer. Stop your timer, and see how long it took. Then, look for the answers key, which, once posted, will be linked in a comment at the end of this post.

#### Table 1: Convert Masks, Drill 1

 Binary Prefix DDN 1 11111111 11111111 11111100 00000000 2 /13 3 255.255.255.224 4 11111111 11111111 11111100 11110000 5 /23 6 255.252.0.0

#### Opinion:

Here’s the running tally of how fast you and your peers think you need to be able to go with these problems to be ready for the ICND1 or CCNA exam. Voice your opinion!

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1. HectorJ December 13, 20:56

What would be the suggested speed per exercise?

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• CCENTSkills Author December 14, 09:41

Hector,
I think 15 seconds each is a great goal for exam day. Start the clock once you have the math in front of you, like this exercise.
Wendell

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